NEW DEAL: Thibaut Courtois will extend his stay with Chelsea to 2018 [PA]

And Starsport understands the annoucement that they are extending his current deal - which has another year left on it - will be made before he plays for Atletico Madrid against the Blues at Stamford Bridge next week.

Blues boss Jose Mourinho and the west London club are furious UEFA have vetoed a clause that Atletico would have to pay £5m for Courtois to face them in the first leg of their Champions League semi-final in Spain tonight and back at the Bridge in eight days.

And the timing will be a big statement that the Belgium star is their man for the future and coming back to Chelsea next season.

Sources in his homeland claim Courtois is so higly-rated he has landed a deal worth £175,000-a-week - three times his current salary.

The timing of such an announcement is sure to put extra pressure on the 21-year-old.

Yesterday he said: "I'm at Atletico but Chelsea is my team. It's best not to think about it too much and play as usual.

LOAN STAR: Thibaut Courtois is set to play for Atletico against parent side Chelsea [AFP]

"If you think you have to be careful, in the end you'll play badly."

“You just accept, or if you don't accept you don't make any comment, UEFA decided and managers don't comment”

Jose Mourinho

Mourinho yesterday refused to be drawn into the row over Courtois playing, something that could not have happened in the Premier League if he was loaned to a rival club.

"I think that on UEFA decisions, it's better not to comment," he said.

"You just accept, or if you don't accept you don't make any comment, UEFA decided and managers don't comment."